Horsepower Question

[Curley]

I just dyno'ed my 383 today and I was wondering if my horsepower numbers are a little low. Maybe not low, but after looking around here maybe my expectations were too high. I am happy with the torque but i thought the horsepower would be higher. In the car it made 357rwhp and 420rwtq. It was meant to be a street driven car and no strip time. It is running through a tko600 to a stock 10 bolt with a posi. Im figuring with 12% loss it should be approximately 410hp and 475tq at the crank. Dont get me wrong, the thing is a monster and now I need sub frame connectors. Just thinking the horsepower would be closer to the torque. Am I being too critical or just unrealistic?

Thanks